epidemiology
The scientific study of the distribution and determinants of health-related states in populations. Used in medical and public health contexts.
Epidemiological research revealed the route of infection.
She is majoring in epidemiology at university.
immunology
epidemiologist
epidemiological investigation; epidemiological survey
From 疫 (えき, 'epidemic') + 学 (がく, 'study'). A straightforward compound of Sino-Japanese elements.